21429532 has 12 divisors (see below), whose sum is σ = 37852920. Its totient is φ = 10614416.

The previous prime is 21429451. The next prime is 21429533. The reversal of 21429532 is 23592412.

It is a self number, because there is not a number n which added to its sum of digits gives 21429532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24607 + ... + 25462.

It is an arithmetic number, because the mean of its divisors is an integer number (3154410).

Almost surely, 2^21429532 is an apocalyptic number.

It is an amenable number.

21429532 is a deficient number, since it is larger than the sum of its proper divisors (16423388).

21429532 is a wasteful number, since it uses less digits than its factorization.

21429532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50180 (or 50178 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21429532 is about 4629.2042512726. The cubic root of 21429532 is about 277.7607623829.

The spelling of 21429532 in words is "twenty-one million, four hundred twenty-nine thousand, five hundred thirty-two".